The Fellowes 24-Inch Widescreen Laptop Flat Panel Privacy Filter uses blackout technology to darken the screen image when viewed from the side so only the user can see the screen. It helps protect sensitive information and client confidentiality when you are working in a public place. The anti-glare filter reliably reduces screen glare so your eyes stay more comfortable during long periods of computer use. It also protects your laptop screen from dust, scratches, dirt and accidental damage. This laptop screen privacy filter is easy to attach and remove.